the correlation coefficient treats all relationships as linear, but not all are. Can you think of some examples of non-linear relationships that might occur in educational research?
What will be an ideal response?
There are a wide range of non-linear relationships in educational research. One example is the relationship between teacher subject knowledge and pupil outcomes. Research
generally finds that there is a positive relationship, i.e. more subject knowledge leads to better outcomes, but that this effect tails off, and has largely the following shape:
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Assume you are using GRE scores and undergraduate grades to predict graduate GPA. If the correlation of GRE scores and undergraduate grades were .18 rather than .56, then GRE scores would be ____ for predicting graduate GPA
a. more useful c. less useful b. equally useful
Which one of the following scenarios is most consistent with the Strange Situation?
a. A mother and her young child enter a playroom, where the child encounters a variety of new toys and other objects. Some of the objects (e.g., a jack-in-the-box, a picture of a ferocious dinosaur) are intentionally scary and anxiety-arousing. b. A mother and her young child come to a preschool class for the first time. The child's social behaviors are observed and recorded, with a particular focus on how often the child initiates interactions with unfamiliar peers. c. A mother and her young child are in a playroom. Soon after, an unknown adult joins them, and then Mom leaves the room for a few minutes. The child's behaviors are observed through a one-way mirror. d. A baby lies in a specially designed infant seat where he or she sees a variety of visual displays on a screen. By sucking on a plastic nipple, the infant can control which displays appear most frequently.
Which of the following is a correctly stated alternative hypothesis?
a. 
: 
? 3
b. : µ = 3
c. : ? = .05 (two-tailed)
d. : µ ? 3
Teachers at a moderate developmental level exhibit which of the following characteristic(s)?
a. Does not have the ability to generate possible solutions b. Needs assistance examining all options c. Unable to collaborates in developing a comprehensive plan d. Cannot share perceptions and alternatives